Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

Check transmission wire.
PREPARATION:

Disconnect the transmission wire connector.

CHECK:

Measure resistance between SLU⁺ and SLU^- of transmission wire.

OK:

Resistance: 5.0 - 5.6 Ω at 20 °C (68 °F)

CHECK:

Fig 1: Measuring Resistance Between SLU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure resistance between terminals SLU⁺ and SLU^- of the transmission wire connector and body ground.

OK:

Resistance: 1 MΩ or higher
1. NG : Go to step 3 .
2. OK : Go to next step.
Measure resistance between terminal SLU⁺ and SLU^- of ECM connector.
PREPARATION:
1. Connect the transmission wire connector.
2. Remove the ECM hood.
3. Disconnect the connector of the ECM.
CHECK:

Measure resistance between terminals SLU⁺ and SLU^- of ECM connector.

OK:

Resistance: 5.0 - 5.6 Ω at 20 °C (68 °F)

Fig 2: Measuring Resistance Between Terminals SLU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK:

Measure resistance between terminals SLU⁺ and SLU^- of the ECM connector and body ground.

OK:

Resistance: 1 MΩ or higher
1. NG : Repair or replace the harness or connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Check and replace the ECM (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
Check shift solenoid valve SLU.
PREPARATION:
1. Remove the oil pan.
2. Disconnect the solenoid valve connector.
  CHECK:
  
  Measure the resistance between terminals 1 and 2.
  
  OK:
  
  Resistance: 5.0 - 5.6 Ω at 20 °C (68 °F)
1. NG : Replace the shift solenoid valve SLU (See VALVE BODY ASSEMBLY ).
  
  Fig 3: Measuring Resistance Between Terminals 1 And 2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. OK : Repair or replace the transmission wire (See ATF TEMPERATURE SENSOR ).